There never was a 260-minute version.
The catalog card at The Library of Congress lists the footage as 20,000 feet for their 35mm print, which would match the duration given in the Catalog of Copyright Entries of 221 minutes.
World premiere at the Warner Cinerama Theatre on 2/15/65
Below is...
It was on TCM a few days ago. Compared to the Blu-ray, the TCM broadcast is cropped on the top and both sides. The Blu-ray is brighter and has more detail. Both have the opening titles in stereo sound.
Uninstall and reinstall not working anymore. Fire TV Stick 4k Max not supported for Dolby Digital 5.1. Fire TV Stick 4k is.
Others have reported that surround sound was turned off recently by youtube tv. Turned it back on.